Mairsil, the Pretender, Morphling, Gilded Lotus, and Quicksilver Elemental

Prerequisites

• Mairsil, the Pretender on the battlefield
• Morphling in exile
• Gilded Lotus in exile
• Quicksilver Elemental in exile
• Mairsil does not have summoning sickness

Steps

1. Activate Mairsil using Gilded Lotus' ability by tapping it, adding
2. Activate Mairsil using Morphling's first ability by paying , untapping Mairsil
3. Activate Mairsil using Quicksilver Elemental's ability by paying , causing Mairsil to gain all activated abilities of itself until end of turn
4. Repeat

Results

• Infinite colored mana
• Infinite tap triggers